1.5,2,2.5,3 Modul 45# Steel Spur Gears Pinion Cog CNC Plasma Router 15-50 Tooth
1.5,2,2.5,3 Modul 45# Steel Spur Gears Pinion Cog CNC Plasma Router 15-50 Tooth
1.5,2,2.5,3 Modul 45# Steel Spur Gears Pinion Cog CNC Plasma Router 15-50 Tooth
1.5,2,2.5,3 Modul 45# Steel Spur Gears Pinion Cog CNC Plasma Router 15-50 Tooth
1.5,2,2.5,3 Modul 45# Steel Spur Gears Pinion Cog CNC Plasma Router 15-50 Tooth
1.5,2,2.5,3 Modul 45# Steel Spur Gears Pinion Cog CNC Plasma Router 15-50 Tooth
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1.5,2,2.5,3 Modul 45# Steel Spur Gears Pinion Cog CNC Plasma Router 15-50 Tooth1.5,2,2.5,3 Modul 45# Steel Spur Gears Pinion Cog CNC Plasma Router 15-50 Tooth1.5,2,2.5,3 Modul 45# Steel Spur Gears Pinion Cog CNC Plasma Router 15-50 Tooth1.5,2,2.5,3 Modul 45# Steel Spur Gears Pinion Cog CNC Plasma Router 15-50 Tooth1.5,2,2.5,3 Modul 45# Steel Spur Gears Pinion Cog CNC Plasma Router 15-50 Tooth1.5,2,2.5,3 Modul 45# Steel Spur Gears Pinion Cog CNC Plasma Router 15-50 Tooth

1.5,2,2.5,3 Modul 45# Steel Spur Gears Pinion Cog CNC Plasma Router 15-50 Tooth

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Price:
$10.17 USD
Stock:
In stock (500 units), ready to be shipped

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Description

45# Steel Spur Gears — Precision-Cut Pinion Cogs for Reliable Power Transmission

When a slipping or undersized gear brings your CNC router, plasma cutter, or automation rig to a halt, you need a replacement you can trust to hold tolerance under load. These 45# steel spur gears are engineered for makers, robotics builders, and small-batch manufacturers who demand consistent mesh quality across every module and tooth count in their drive train.

Each spur gear is machined from 45# medium-carbon steel — a material known for its balanced hardness and machinability — and is available in four standard metric modules (1.5, 2, 2.5, and 3) with tooth counts ranging from 15 to 50. Outer diameters span approximately 24 mm (0.94 in) for the smallest 1.5 Mod 15T variant up to approximately 123 mm (4.84 in) for the largest 3 Mod 40T variant, covering a wide range of gear-ratio and center-distance requirements.

Typical applications include CNC plasma and router axis drives, DIY gearbox assemblies for 3D-printer extruder upgrades, and custom robotics joint actuators where a standard metric spur gear pinion cog is required for repeatable, low-backlash power transfer.

⚙️ Compatible with standard metric module gear systems (Mod 1.5 / 2 / 2.5 / 3). Verify bore diameter and keyway requirements before ordering.

✅ Key Features of These 45# Steel Spur Gears

🔩 45# Medium-Carbon Steel Construction — Offers a practical balance of surface hardness and core toughness, resisting wear under sustained meshing loads without becoming brittle.
📐 Four Standard Metric Modules — Available in Mod 1.5, 2, 2.5, and 3, making it straightforward to match an existing gear train or design a new one using standard metric pitch geometry.
🔢 Wide Tooth-Count Range (15–50T) — Covers gear ratios from direct-drive pinion applications up to significant speed-reduction stages, all within a single product family.
✂️ CNC-Machined Tooth Profile — Each gear is cut to involute tooth geometry for smooth, consistent engagement and reduced noise compared to cast or stamped alternatives.
🏭 Broad Application Compatibility — Suited for CNC plasma cutters, router axis drives, robotics joints, DIY gearboxes, and small automation equipment requiring standard metric spur gears.
📦 Single-Piece or Multi-Pack Options — Order as 1PCS to replace a single worn pinion, or select a multi-pack quantity to stock spares for ongoing maintenance or batch builds.

📐 Technical Specifications — Metric Spur Gears

Material 45# Medium-Carbon Steel
Gear Type Spur Gear (Involute Tooth Profile)
Available Modules 1.5 / 2 / 2.5 / 3
Tooth Count Range 15 – 50 Teeth
Pressure Angle 20° (standard metric)
Outer Diameter See variant options
Bore Diameter See variant options
Face Width See variant options
Surface Finish Machined (natural steel)
Quantity per Order 1PCS (multi-pack options available)

❓ Frequently Asked Questions

How do I choose the right module and tooth count for my application?

The module (Mod) defines the tooth size and must match between meshing gears — a Mod 2 gear will only mesh correctly with another Mod 2 gear. The tooth count determines the gear ratio: divide the driven gear's tooth count by the driving gear's tooth count to get the ratio. Start by identifying the module already used in your drive train, then select a tooth count that achieves your target speed or torque ratio.

What is 45# steel and how strong is it?

45# steel is a Chinese standard medium-carbon steel (roughly equivalent to AISI 1045) with a typical tensile strength of 600–800 MPa in the normalized condition. It provides good wear resistance for moderate-load gear applications and can be further hardened by heat treatment if higher surface hardness is required for heavy-duty use.

Are these gears corrosion-resistant?

45# steel is not inherently stainless. For indoor or dry environments the natural machined surface is adequate. For humid or outdoor applications, we recommend applying a light machine oil or grease to the gear teeth and bore, or considering a protective coating such as black oxide or zinc plating applied after purchase.

Will these spur gears fit my existing CNC router or plasma cutter axis?

Compatibility depends on three factors: module (must match), bore diameter (must fit your shaft), and face width (must align with your mating gear). Please confirm the module and bore size of your existing drive components before ordering. If you are unsure, contact us with your machine model and we can advise on the correct variant.

Can I use these gears in a robotics joint or servo-driven actuator?

Yes. These spur gears are commonly used in DIY robotics joints, servo gearboxes, and small actuator assemblies. For servo applications, select the module and tooth count that matches your target gear ratio and ensure the bore diameter accommodates your servo output shaft. For high-cycle or high-torque joints, consider pairing with a hardened mating gear.

How do I calculate the center distance between two meshing spur gears?

Center distance (C) = (Module × (Teeth on Gear 1 + Teeth on Gear 2)) ÷ 2. For example, a Mod 2 gear with 20 teeth meshing with a Mod 2 gear with 30 teeth gives C = (2 × (20 + 30)) ÷ 2 = 50 mm. Use this formula to set the correct shaft spacing in your housing or frame design.

What is the difference between the 1.5, 2, 2.5, and 3 module options?

A higher module number means larger, stronger teeth with a coarser pitch. Mod 1.5 gears are compact and suited for light-load, space-constrained applications. Mod 2 is a versatile general-purpose choice. Mod 2.5 and Mod 3 gears carry heavier loads and are better suited for high-torque drives such as plasma cutter gantries or industrial-style automation axes.

🛒 Select your module and tooth count above, then add to cart.

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